Improvement in the construction of school-globes



inf

ling,- drawing, forming part of this speciiication, in which'manufacture of my globes.

"pasteboardwhich AI use in the manufaetiu'e of my i W i 1. nel ,tetes I-my anni Letters Patent No. 84,398, llavtezlrNorcmlm/r 24, 1868.

IMPROVEMENT IN THE CONSTRUCTION' OF SCHOOL-GLOBES.

The Schedule referred to in these Letters Patent and making part of thesame.

To all when?, it may concern: l

Be it knownthat I, EDWARD Wurssnxnons, of Hudson Cit-y, in the county ofHudson, State ot' New Jersey, have invented anew and useful Improvementin School-Globes; and l do hereby declare the tbllow'-, ing to be afull, olea and exact description thereof, which will enable thoseskilled in the art to make and use the same, reference being,- had tothe aeeompanydrawing-.

Figure l represents a central section of the. mould which I use in themanufacture ot' my globes.

-Figure 2 is a central section oi". the globe when 'iin-l ished.

Figure 3 is aplan' of the blanks which I use in the Similar lettersindicate eorrespomlingg, parts.

This invention consists in the peculiar manner ot' cutting out theblanks, and of unitinfoY the same, cach hemisphere of the globe beingmade of two or more circular layers of pastehoard, which are cutout toform a series of radiating arms, with intermediate triangular spaces,and laid, one on'the top of the other, so as to break joints, and thatby applying glue or other cement between the two layers, and snhiectingthe same to a heavy pressure in a suitable mould, (which may be heated)the several layers are rmly united, and the edges of the various armsare brought together in sue-h a manner that a smooth, strong, anddurable hemisphere is produced.l The hemispheres thus produced areturned off true at their edges, and finally united by an internal stripof pasteboard, and then smoothed ott" ready for the maps.

A, iig. 3, represents one ot' the blanks or layers of globes. Theseblanks I cutout, so that the same form a series of radiating arms, 1-,as shown in tig. 3, and, after the blanks have been` properly prepared,I select two, apply to the surface of one ot' them glue or othersuitable cement, place the other on it, so as to break joints, or sothat the arms of the second blank will cover the open spaces 'betweenthe arns oi' the firsts; blank, and before the glue or other cement hasset, I introduce the two blanks into the mould li.

This mould consists ot' the male part b and the female part e, andeither one or both parts are heated by steam or hot air, which maybeintroduced through a pipe, d, and exhausted through pipe, c.

After the two layers of pastelmard, prepared as abovedescribed, haveheen adj ustedmn'the male part ofthe mould, the female part is forceddown by means ot' hydraulic or other powerful pressure, and the twolayers of pasteboard are formed into a hemisphere, the edges of the armsfof each layer being, brought close together, and tirmly united toeael'i other by the glue or other cement appliedto one ot' the layers,and by the adjacent arms of the-other laver.

The hemispheres thus tormed are turned oit true at their edges, and, byuniting two such hemispheres, ulohesot' the required kind are produced.

Thel operation of 'uniting the two hemispheres is conducted as tollows:l take a strip, j, of pas'tehoard, glue it fast to the inner surlace ot'one hemisphere, with its edge projecting some distance beyond the edgeoi' said hemisphere, and then I place the other hemif sphere over it,always taking care that the whole outer v surl'ace ot' the strip fiswell covered with glue or otherj cement. By the strip j, the twohemispheres are tirmly united,` and globos are formed, which aredurable, firm,- not liable to leet broken, and which can be produced ata very cheap rate.

lhese globes are prepared for the reception. oi' the maps h v grindingoi`i` theirsnriaoes, so that the same become smooth, and free from allfringes.

Having thus described my invention,

'hat I claim as new, and desire to secure by Letters .Pa-tent, is-

A school-globe, made ot' two layers, A, of pasteboard, eut out to formarms, a, and placed together and united by the aid of the inonld'B, allas shown and described.

Also, the strip f, pasted 'to the inner surface ot' one ',hemisphere,and serving` to fasten and retain the second hemisphere, subshn'ltiallyas set forth.

EDXV. /'EISSENBORA".

Witnesses Luor. SrEiDnL, E. F. KASTENHUBER..

